A manner of generating internal voltages such as a high voltage, an intermediate voltage and an internal power supply voltage is switched in accordance with a power supply level setting signal. The apparatus has at least one pressure space, which are each divided into two pressure chambers acting counter to one another. The parameter and compressing speed setting unit is a unit in which a relation between a predetermined parameter that may affect compression performed by the press unit, and a compressing speed of the press unit. The imaging characteristic to be controlled is a non-linear magnification or curvature of field.